I went to EYCI... I don't recall any tunnels to East General/M Garron Hosp. However there has always been a major storm drain that runs from the old sewage treatment plant in the Don Valley near Don Mills Rd. There is a part of that tunnel system that's big enough to paddle a canoe. It began being modified for increased capacity probably 10 yrs ago and it's still going from last I knew. It has access due to ongoing construction at Barbara Cres and Coxwell. It has to head almost due south to meet up with the treatment plant at Ashbridges. It would have to pass EYCI and E Gen'l Hosp
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https://www.toront...aterfront-project/